New answers tagged interferometry
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The electromagnetic field of a single-wavelength beam (e.g. that of a laser) is sinusoidal with period $\lambda$.
e.g. for one dimension E field can be described as follows (ignoring time evolution):
$$ E = \cos\left(\frac{2\pi}{\lambda}z\right) $$
If you have a second beam that is mutually coherent with the first, the two E-fields can be described as ...
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